/usr/share/genometools/gtdata/trans/TransProt4B is in genometools-common 1.5.1-2ubuntu1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 | # 4-character Stanfel alphabet
ACGILMPSTVJ A
DENQ C
FWY D
HKR E
XUBZO*- X
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